If you are applying for FSW - Canadian Experienced Class, the CEC requirements for the International English Language Testing System (IELTS) are:

If you have qualifying Canadian work experience at Skill Type 0 or Skill Level A of NOC, your test results must match the CLB/NCLC above (see chart): - 7 or higher for each of the language abilities, or - 6 for any one of the language abilities, 7 or higher for any other two of those abilities and 8 or higher for the remaining ability,

If you have qualifying Canadian work experience at Skill Level B of NOC, your test results must match the CLB/NCLC above(see chart): - 5 or higher for each of those abilities, or - 4 for any one of those abilities, 5 or higher for any other two of those abilities and 6 or higher for the remaining ability.